Answers for "change click button"

javascript change button onclick

function Bar() {
  document.getElementById("a").onclick = Foo();
}

how to change the text in a button on onclick

var btn = document.getElementById("mybtn");
btn.value = 'my value'; // will just add a hidden value
btn.innerHTML = 'my text';

change button text by id click java

<input type="button" value="Button Text" id="myButton1"></input>